A useful design tool
|Charles Smitheman||30/01/2015 07:58:46|
|220 forum posts|
I have found this web page most helpful when trying to decide on a power setup, or modification to a model.
This is on the APC official website, and it contains an exhaustive list of the performances of each of their propellers, at varied RPM and air speeds.
I have for example used the data to convert an old model from i.c. to electric. Also, to work out which prop to use if converting a model to a higher lipo cell count.
I simply read off the torque output of the old prop at the rpm (for the electric model governed by the cell count and KV of the motor) at various air speeds, and looked for a prop that gave similar or slightly more power at the new rpm, again governed by the cell count and KV of the motor.
So I was able to take the knowledge that I had (what was already proven to work) and make a fairly correct choice of upgrade.
This worked for me, as previously with electrics I had resorted to "asking an expert!"
Has anyone else found these charts useful, and I would be interested to hear of better ways of using it.
|Graham Bowers||30/01/2015 08:16:23|
40 forum posts
Brilliant, its back, thanks. This excellent resource disappeared for a while.
Remember, under load you only get about 80% of the theoretical (KV*V) rpm.
To prevent the release of the magic smoke, do check the actual performance with a Wattmeter. I like to verify speed with a tachometer too.
|Peter Jenkins||30/01/2015 23:47:58|
|1209 forum posts|
Well spotted Charles!
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